how do I make threads in hardened steel?

Question

I want to make threads in hardened steel I know grinding is one method but not for threads there is a process but i can remember the name of that process

Answer 1

tap and die set?

Answer 2

You could roll or forge the threads into the steel, but this is not a practical solution for someone to actually try since the equipment required is very expensive. These processes are generally only used for mass production.

Other options would be to heat treat the steel back to a softened state (i.e. anneal the steel or normalize it), at this point the steel will be much more machineable and you could grind or machine in the threads. Then of course you will have to re-harden the steel (most likely a quench and temper).

Answer 3

In hardened steel, you would have to grind them.
If you could eneal the steel, you could possible use a tap and go that route.
Why would you want to put threads in a piece of hardened Steel?

There are other methods but the equipment is very expensive.
It might be better if you got another piece of steel, tapped it and then hardened it if needed.

Answer 4

THe best way to make threads on or in hardened steel is to use a tungsten tap or die.
Although they're a little pricey, it surely beats the cost of having a new piece hardened!
I was sure more machinists knew about them......

Answer 5

By definition, you can't!
It depends, however, how "hard" is the steel.
You may use tap and dies, but they will have to be carbide at least.
The other way is to "soften" the steel on the area where you want to thread, using heat (get it red hot with a flame, let it cool down at ambiant temperature).